Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d3db791dc5c50b…

MALICIOUS

PDF

88.3 KB Created: 2021-09-19 08:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b8dfda80e50d1c602f194825f55f918 SHA-1: c18c7343e9571311d26c04e09551ad458e1a6d5e SHA-256: b6d3db791dc5c50b7decea30ef2bd8c2ae9135951a80168638a128baa6fd7727
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/90083492260.pdf In PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/55290237313.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/rijulezitazeluvomol.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090604301318796.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/20779320399.pdfIn PDF document text
    • http://floramarble.com/uploads/65946022094.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/xewob.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/fejozaxexudixete.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/keponenisolakiwiberuvumu.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/5954862207.pdfIn PDF document text
    • http://gaudi.tw/upload/file/23763960965.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/gugafo.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/31058254458.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/79987734561.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/katabisoleworagivol.pdfIn PDF document text
    • http://lgassociates.in/uploads/buwaloz.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/26299343603.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce7a51cd5---papatinasipufukexedaxasaf.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/gomaxevudilunelexanipama.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/wuvufigowefimo.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/japoliv.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/72034961660.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/50aa4e9efc82635def29f265c118df99.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/fevamewovuvuvelipurebereb.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/tololonime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+emulator+for+1gb+ram+pcPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC9 16784 bytes
SHA-256: ec2c347b2121f1ade496044138cabda862c77189e4d513b3473526b8f1902ddd
font_02_sfnt_off00013a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1A 11068 bytes
SHA-256: 6c187feccdca8c74a3a4dfad0e5d1b570797814f6f504284d6020b420a16399c